Fume-arrester



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MALVERN IV. ILES AND DENNIS SHEEDY, OF DENVER, COLORADO.

FU M E-ARRESTVE-R.

SPECIFICATION forming part of Letters Patent No. 484,016, dated October 11, 1892. Application tiled February 8, 1892. Serial No. 420,159l i (No model.)

To all whom it may concern:

Be it known that we, MALVERN W. ILES and DENNIS SHEEDY, both of Denver, Arapahoe county, State of Colorado, have invented a certain new and useful Improvement in Apparatus for Saving and Utilizing Fumes from Metallurgical Furnaces, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part of this specification.'

Our invention relates to the apparatus used for separating solid particles from the products of combustion given oif by metallurgical furnaces. The smoke, gases, dac., are drawn from the furnaces through dust-chambers and cooling-conduits and then forced through screens, generally in the form of bags made of fibrous material, which permit the gaseous products of combustion to escape freely, while retaining the solid particles, consisting, chiey, of metallic sulphides with some carbon, tbc., designated as metallic fumes, the fumes being largely lead sulphide in admiXture with more or less of the precious and other metals, depending `on the character of the ore under treatment. In the most ap. proved practice the smoke, as We may call it, enters a chamber, to the top of which are attached a series of vertical bags, and the solid particles caught in these bags fall down into the chamber below, gradually accumulating upon the' floor thereof, and when a sufficient quantity has thus accumulated it is either set re to while lying on the bottom of the chamber or removed and ignited elsewhere, the best results being obtained by igniting it before removal. The accumulated dust burns freely, and under proper conditions the result of this ignition eliminates the arsenic,which is caught with the other metallic fumes in the bags and fuses or agglomerates the metallic dust to such an extent that it can be handled freely and is in good con dition to be charged into the furnace.

In practice difficulty has been met with owing to the premature or spontaneous ignition of the dust in the chamber, this ignition occurring while the smoke is passing through the chamber and having a very injurious and destructive effect, first, because when ignited under these conditions the dust does not properly fuse together, but after burning is still in a finely-divided or powdery condition, in which state it is not only difcult to handle, but also exposed to losses in transportation and jlossesl in the furnace, as much of it will again simply pass olf throughthe smoke-conduits without being fused. In the second place, the ignition of the dust under the conditions'named is very apt to result in burning and destroying some or all of the bags connected with the chamber in which the fire occurs. In the third place, the ignition of the dust under these premature conditions does not get rid of the arsenic, because while the vapors of that metal or of its compounds are driven off they are immediately caught in the bags and fall again into the dust-chamber.

We have found that the liability to premature ignition, with the consequent evils, can be avoided by the simple device of providing air-spaces beneath the floor of the dust-chamber at the bag-house, preferably using, in connection with these air-spaces, a stack to insure a constant draft of cold air through them and beneath the floor; and We may add that we have obtained the additional advantage of preventing the metallic fumes from fusing to the floor, which was apt to occur under the old conditions even during a proper ignition of the dust.

Reference being now had to the drawings which illustrate our invention, Figure l is a cross-sectional view through a bag-house constructed with our improvement; Fig. 2, a plan View through the ventilated floor on the line l 2 of Fig. 1, showing two adjoining dustchambers. Fig. 3 is a cross-sectional elevavationjof the iioor, taken on the line 5 6 of Fig. l; and Fig. 4, a similar view through a modified construction of the floor.

A A are dust-chambers having a smoke-entrance L, which consists, as shown, of a short metallic tube. This tube is connected with a branch pipe N of a smoke-main O by means of a canvas conduit M.

C lis a sheet-metal partition or floor separating the chambers A from the bag-room proper D, situated above them and in which are hung a series of bagsEE,dependingfrom beams D', the lower ends of which are secured to thimble C', projecting upward from the iioor C. The smoke from the furnaces IOO passes from the main O, through the branches N, tubes` M, and tubes L, to the dust-chambers A, of whichA there may be any number in series, and from these chambers it passes through the thimble C' into the bags E, the gaseous products of combustion escaping through the bags into the ventilated room D,

While the'solid particles are retained in the bags and fall therefrominto the chambers A, upon the floor of which they accumulate.

The chambers A, We should here mention, are made of masonry and have doors R, usually kept securely closed, but which can be opened when it. is desired to ignite the dust or to remove it from the chambers.

To the extent above described the apparatus shown is the sole invention of the applic'anzt Iles and forms the subject-matter of .another application for' Letters Patenti tiledv by him. February 6, 1892, Serial No. 420,612..

.. bers A have been'provided with floors of hard vAs heretofore constructed,`however, the cham- .brick laidfrupon the aground, and with this Y v:construction the dust has'been subject tothe .dangersand disadvantages of--premature ig- '.nition, as. above set fforth. We have disw coveredthatthesey dangers-can be avoided by ".constructing the floors with vair-spacesober :fneath them, .which Y'prevents the accumula--A tion ofvheat during the tiring of the dust, and

whenliproper means are taken to secure an `energetic ventilation also act as `efficient i .meansfor carrying away the heat and keep- .ngthe accumulated dust ata temperature u solow that lit `is no; longer in danger of spon` taneous combustion.- The air-fines necessary rto coolfthefloor may be constructed inv any y fconvenientway. In therdrawings We` have @illustrated twonsimple and'v efficient plans;

t '.x-Thus, upon rthe ground, or preferably upon a course of `bricks F, is set a series of vertical. bricks G, so as tolform tlues I-I between them Upon'these, again, is supported a course of Ybricks I, forming a licor, and preferably a second course J is laid upon the bricks I to form a more perfect and efficient As shown in Fig. 2, the lines I-I are run through the length of the chamber, commul nicating with cross-lines I-I and a stack or -fpipe K, arranged in the center of the cham- .chamber l) above.

ber, passing up through it, opening into the By this construction an energetic ventilation through the air-lues is assured, and the stack K, which may be conveniently made of iron pipe, also receives and transmits heat from the chamber A to the `air passing through it. Obviously the stack may be arranged in any convenient place; but a distinct advantage is obtained by causing it to open into the bag-room and at or near the level of the floor thereof, as the air issuing lfrom it will act to cool down the floor and prevent the collars C from getting hot enough to'burn the bags. The 4supply of cooler air tothe bag-room in this way of course aids in the general ventilation of the chamber.

In Fig. 4 we have illustrated a double-Hoor arrangement, the bricks which formthe tops of the'llues II being in this construction of hollow tile, the hollow portions H of which form a second series of cooling-lines above the tlues I-l.

We will mention here that the canvas tube M is disconnected'from tube L and one or both doorsR opened before the dust in chamber A is ignited. Thus the chamber is disconnected from the smoke-main O, and at the same time abundant openings to the air provided for-the escape of the hot'gases from the burning dust, which will not under these con- -ditions pass into the bags E. It is also advisable to remove a few of the bags E from the collars C above thefdoors R, so-th'atthe heat can escape .freely duringthe burning of the dust and 'without danger of' burning the bags.

4vI-Iaving nowd'escribed vour i-nventiom'fwhat we claim asnew, and desire toE secure byLetters Patent, is-v l. Inicombination with the smekelmain, a series of lmasonry chambers A,.connected:with

said main and connected with a'series of bags.

`air-lines formed lbeneath their floors-.and

stacks K,fconnected with the lines and leading upward therefrom, substantially as and for the purpose specified.l

4t. In combination With the smoke-main, a series of masonry chambers A, connected with said main and connected with a series of bags E E, the., as described, said chambers having air-fines formed beneath their floors, and stacks K, connected with the flues and leading through the chambers to and thro'ughthe top thereof, substantially as and for the purjl pose specified.

5. In combination with the smoke-main, a series of vmasonry chambers connected with E E, te., as described, said chambers having air-fines formed beneath their floors, and stacks K, connected with the ues and opening in the bag-room at or near the level of the floor thereof.

MALVERN W. ILES. DENNIS SHEEDY.

Witnesses:

C. T. DYE, J. H. TUCKER.

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vthe main and connected with a series of bags 

